EP1133057A2 - Touch switch with LC display - Google Patents

Touch switch with LC display Download PDF

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Publication number
EP1133057A2
EP1133057A2 EP01105768A EP01105768A EP1133057A2 EP 1133057 A2 EP1133057 A2 EP 1133057A2 EP 01105768 A EP01105768 A EP 01105768A EP 01105768 A EP01105768 A EP 01105768A EP 1133057 A2 EP1133057 A2 EP 1133057A2
Authority
EP
European Patent Office
Prior art keywords
lc display
touch switch
sensor element
characterized
switch according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01105768A
Other languages
German (de)
French (fr)
Other versions
EP1133057A3 (en
EP1133057B1 (en
Inventor
Martin Baier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Priority to DE10011645 priority Critical
Priority to DE2000111645 priority patent/DE10011645A1/en
Application filed by EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP1133057A2 publication Critical patent/EP1133057A2/en
Publication of EP1133057A3 publication Critical patent/EP1133057A3/en
Application granted granted Critical
Publication of EP1133057B1 publication Critical patent/EP1133057B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7634194&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1133057(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • H03K17/962Capacitive touch switches
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • H03K17/962Capacitive touch switches
    • H03K17/9622Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • H03K17/9627Optical touch switches
    • H03K17/9629Optical touch switches using a plurality of detectors, e.g. keyboard
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96Touch switches
    • H03K2217/96031Combination of touch switch and LC display

Abstract

In one exemplary embodiment, the invention provides a touch switch with an LC display (11, 26), the LC display having two parallel glass plates (12, 13) lying on top of one another, between which conductive layers (15, 16) provided with connections (29) ; 27, 28) for displaying individual segments (24, 25) of the LC display. According to the invention, at least one sensor element (19; 21, 22) of the touch switch is arranged below the surface (14) of the LC display, the touch switch being operable by touching the surface of the LC display above the sensor element. On the one hand, sensor elements (19; 21, 22) of touch switches known from the LC display can be arranged for this purpose. On the other hand, sections of the conductive layers (27, 28) can be controlled in interval operation both to display LCD symbols (24) and as sensor surfaces of capacitive touch switches. <IMAGE>

Description

The invention relates to a touch switch or Touch switch unit, in particular for an electrical device, with an LC display, the LC display at least has two parallel plates lying between each other which are conductive layers with connections or Layer sections for displaying individual segments of the LC display are arranged. Located between layers a liquid crystal. On the front plate is advantageous a polarization filter attached. Under the lower one There are either a backlight and a plate Polarization filter (transmissive type) or a reflection layer (reflexive type). The conductive are via the connections Layers to show the segments from the outside controllable in the usual way (opposite pole to the representation of a Segment by means of a dark surface).

LC displays are used in many areas for display of information, for example in small format in watches or in larger format in advertisements of electrical appliances or Notebook screens. For example, the LC display shows a state of the like or switch. to the Device is changeable at will.

TASK AND SOLUTION

The invention has for its object a touch switch of the type mentioned at the outset, the one Combination of an LC display with a touch switch enables.

This task is solved with a touch switch the features of claim 1. Advantageous refinements the invention are the subject of further claims and are described below.

According to the invention is below the surface of the LC display arranged at least one sensor element of the touch switch, the touch switch being touched by the Surface of the LC display above the sensor element can be actuated. Thus, on the one hand, the possibility can be created are prefabricated by a single built-in module can be both an ad and an ad To provide switch unit. It is also advantageous possible through the display with the LCD segments display the exact position of the touch switches, for example for "+" or "-" displays or direct activation of one "off" field. Such displays can be found in electrical devices be installed and both as function displays and serve as fields of activity, similar to switches. As another For example, remote controls or the like. with big Displays are equipped with different displays Display functional states of the device. By pressing the associated sensor elements or touch switches as a result A finger can be placed on the display surface Functional status can be changed. Both display of Functional states as well as the associated switching function can be variable, for example divided into several sub-functions.

According to one embodiment, this can be at least one Sensor element arranged in the area of the segments of the LC display his. A range between is particularly suitable different segments or within an open segment, for example like a frame the touch field displays.

It is possible that the at least one sensor element under the to arrange the lower plate. It is preferably separate of it and separable, so that standard components can be used.

According to one possibility, the touch switch can be a Reflective light barrier as a sensor element with a Light emitting device and a light receiving device. The reflex light barrier can advantageously be used without consideration on the arrangement of the conductive layers of the LC display be positionable. It is only necessary to note that a segment shown would disturb the light path, therefore there should be no segment in the light path. It offers itself in particular the use of IR light. To save energy as well as to avoid interference from interspersed The reflected light barrier in the Intermittent operation, especially work the transmitter and the receiver in interval operation.

According to a fundamentally different execution option the sensor element can be designed as a capacitive sensor element his. Once this can be done in the form of a flexible conductive Be foam body, for example a foam cylinder. Such a sensor element is at one point of the LC display without segments or conductive layer above arranged. The one placed on the lower plate of the display The surface of the foam body acts like a capacitor plate a capacitive sensor element. Such The functioning of sensor elements is sufficient known.

According to a further embodiment of a capacitive Sensor element can be a conductive sensor layer or a Sensor layer section between the plates or on a the inside of the plates of the LC display as a sensor surface be arranged. Thus the sensor element is in the LC display not only functional but fully integrated. The sensor layer is preferably in the plane of one of the two conductive layers of the LC display. It can be act a separately applied layer. Especially the sensor layer or the layer section is preferred one of the two conductive layers of the LC display formed by the to represent the segments required layer areas is electrically isolated.

It is possible in a further embodiment of the invention that the sensor layer of a section of at least one of the two conductive layers is formed in one area or from a section that can be used for segment display is. The LC display is in alternating operation with at least two operating modes can be controlled. The conductive Layers become opposite-pole on the one hand via the connections for segment display and, on the other hand, separately or advantageously operated short-circuited as a sensor element. The means that there is a segment display alternating with the Sensor element function. The change should be so quick that the human eye is permanent Perceives segment display, for example with a Frequency from over 50 Hz to several hundred Hz Conductive layers can be driven with an alternating current be, especially with a frequency of 30 kHz up to 100 kHz for the sensor element function.

These and other features go beyond the claims also from the descriptions and drawings, the individual features each individually or too several in the form of sub-combinations in one embodiment of the invention and in other fields be and advantageous as well as protective designs can represent, for which protection is claimed here. The division of the application into individual sections as well Subheadings limit those made under them Statements are not generally applicable.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

Fig. 1
Section through an LC display with a foam sensor element underneath and a reflex light barrier,
Fig. 2
Top view of an LC display according to FIG. 1,
Fig. 3
Section through an LC display with layer sections also operated as a sensor element for segment display and
Fig. 4
Top view of an LC display according to FIG. 3.
DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1 shows an LC display 11 in section, the upper one Glass plate 12 and a lower glass plate 13. Instead of Glass plates can use other transparent materials be used, for example made of plastic. Between Glass plates 12 and 13 are an upper conductive Layer 15 and a lower conductive layer 16, which in individual sections are divided. This subdivision corresponds to the outline of the LCD symbols to be displayed, see Fig. 2. Laterally the glass plates 12 and 13 are through an adhesive bonded 17. Between the glass plates, too there is a liquid crystal between layers 15 and 16 18. This is essentially the basic structure of an LC display.

The lower conductive layer 16 can be outlined can also be different or larger than the upper layer 15. However, it should be noted that on the one hand at least the sections the upper layer. On the other hand the connections for the top layer should not be covered become. A layout for the two layers 15 and 16 can similar to a PCB layout.

Usually located on the front on the surface 14 another polarization filter, which is here for clarity was omitted for the sake of it. Furthermore points a conventional LC display behind the lower glass plate 13 either a reflective layer or a backlight and a polarization filter. This is also on here the presentation has been waived.

Under the LC display 11 are placed on the bottom of the lower glass plate 13, on the left side two foam sensor elements 19 made of conductive foam. Foam sensor elements of this type are, for example, in described in DE 197 06 168. The one against the glass plate The surface of the sensor element 19 forms the otherwise Usual conductive surface of a capacitive sensor element. The control and evaluation are not shown however, can be found in the above-mentioned application.

Both sensor elements 19 are placed on such that no portion of the upper conductive layer 15 or 16 runs. This would save the capacitive sensor elements Set function, since then there are no electrical field lines can form over the sensor element. Likewise, none are allowed Connection tracks for the layer sections run over it. A non-metallic reflective layer usually interferes Not.

On the right side there is a light emitting device under the LC display 21 and a light receiving device 22 arranged according to the principle of a reflex light barrier. The Light emitting device 21 emits light, preferably in IR range. By placing a finger on top of it some of the light is reflected downward and from the light receiving device 22 collected and evaluated as Triggering the touch switch. The arrangement of the reflex light barrier is basically independent of conductive Layers, however, no LC symbol in the light path lie between the transmitting device and the receiving device.

This is only possible if the light has the LC symbol can penetrate, for example at a suitable wavelength.

FIG. 2 shows the LC display 11 from FIG. 1 in a top view. It can be seen that under an LCD panel 24 left sensor element 19 is located. The LCD panel 24 can possibly depending on the situation, on the actuation of this sensor element by placing a finger on the surface 14 of the upper glass plate 12. The right sensor element 19 is under one applied to the surface 14 Mark 20 placed.

The one formed by the transmitting and receiving device 21 and 22 Reflex light barrier is diagonally apart below an LCD panel 24 arranged in the form of a plus sign. So if an operation is in any way of higher quality or the like the plus symbol 24 can be used pressed or put a finger on it. Between a common LCD number 25 is shown, the Value e.g. can be changed using the plus symbol.

FIG. 3 shows an LC display 26 with two glass plates 12 and 13 and liquid crystal 18. Similar to FIG. 1, the two glass plates have an upper conductive layer 27 and a lower conductive layer 28, the shape of which is shown in FIG. 4 can be seen. The individual sections are each provided with electrical connections 29, which are led out of the LC display in a manner similar to printed circuit board paths and are connected to a μ- processor 30. In this way, each individual section of the layers can be controlled separately. The representation of the guidance of the connections 29 has been omitted here. 4 shows how the individual LCD fields 24 look in LCD mode.

The LC display 26 is conductive for the interval operation Layers 27 and 28 both as an LCD display as well designed as a capacitive touch switch. About the electrical connections 29, the individual sections of the layers 27 and 28 driven on the one hand as an LCD display become. For this purpose, the layers are driven with opposite poles like a normal LCD display.

On the other hand, the layers can be connected via the connections 29 are short-circuited or the fields of the upper layer 27 as a capacitive touch switch or as a sensor surface be driven for it. Then, however, no LCD symbol being represented. It is particularly advantageous both operating modes alternate so quickly in interval mode to carry out that in the end both is possible. For example, with a frequency of over 50 Hz, better over 70 Hz, alternately in the LCD mode and in the Touch switch operation can be changed. This is on the one hand, the LCD symbol is permanently visible to the user and on the other hand the touch switch almost constantly activated. In addition, it is possible to the respective Interpret residence times differently, for example for LCD operation longer than for touch switch operation.

A prerequisite for this operating mode is that section the layer that becomes the sensor element, not with the rest of the layer, especially the lower one Layer that may be connected. Over this section must not have any tracks for connections 29 either. Becomes operated a section of a layer as a sensor element, the a section opposite the other layer for LC display is arranged, the two sections for the Short-circuit the duration of the sensor element function.

Claims (10)

  1. Touch switch, in particular for an electrical device, with an LC display (11, 26), the LC display having two parallel plates (12, 13) lying one on top of the other, between which conductive layers (15) provided with connections (29) 16; 27, 28) for displaying individual segments (24, 25) of the LC display, characterized in that at least one sensor element (19, 21, 22, 27) of the touch switch is located below the surface (14) of the LC display is arranged, wherein the touch switch can be actuated by touching the surface of the LC display above the sensor element.
  2. Touch switch according to Claim 1, characterized in that the at least one sensor element (19, 21, 22) is arranged in the region of the segments (24, 25) of the LC display (11, 26), in particular in a region between different segments or within an open segment.
  3. Touch switch according to Claim 1 or 2, characterized in that the touch switch has a reflective light barrier as a sensor element with a light emitting device (21) and a light receiving device (22), the reflective light barrier preferably regardless of the arrangement of the segments (24, 25) or the conductive ones Layers (15, 16) of the LC display (11) can be positioned.
  4. Touch switch according to Claim 1 or 2, characterized in that the sensor element (19, 27) is designed as a capacitive sensor element.
  5. Touch switch according to Claim 4, characterized in that the sensor element is a flexible, conductive foam body (19), the foam body at one point on the LC display (11) without segments (24, 25) and / or conductive layer (15) and connections (29) is arranged above.
  6. Touch switch according to Claim 4, characterized in that the sensor element has a conductive sensor layer (27) between the plates (12, 13) of the LC display (26) as the sensor surface.
  7. Touch switch according to Claim 6, characterized in that the sensor layer lies in the plane of one of the two conductive layers (27, 28) of the LC display (26), preferably the upper layer (27).
  8. Touch switch according to Claim 6 or 7, characterized in that the sensor layer is formed by at least one of the two conductive layers (27, 28) of the LC display (26), it being formed by the layer sections required to represent the segments (24, 25) is electrically isolated.
  9. Touch switch according to Claim 6 or 7, characterized in that the sensor layer is formed by at least one of the two conductive layers (27, 28) in a section which can be used for segment display, the LC display (26) being controllable in alternating operation and the conductive layers being operated via the connections (29) in two operating modes, on the one hand in opposite polarity to the segment representation and on the other hand short-circuited as a sensor element.
  10. Touch switch according to Claim 9, characterized in that the conductive layers (27, 28) are driven with an alternating current, in particular with a frequency of 30 kHz to 100 kHz for the sensor element function, the frequency of the change between the operating modes preferably being at least 50 Hz .
EP20010105768 2000-03-10 2001-03-08 Touch switch with LC display Active EP1133057B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10011645 2000-03-10
DE2000111645 DE10011645A1 (en) 2000-03-10 2000-03-10 Touch switch with an LC display

Publications (3)

Publication Number Publication Date
EP1133057A2 true EP1133057A2 (en) 2001-09-12
EP1133057A3 EP1133057A3 (en) 2003-04-23
EP1133057B1 EP1133057B1 (en) 2008-11-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010105768 Active EP1133057B1 (en) 2000-03-10 2001-03-08 Touch switch with LC display

Country Status (7)

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US (1) US20010020578A1 (en)
EP (1) EP1133057B1 (en)
JP (1) JP2001318366A (en)
AT (1) AT414346T (en)
AU (1) AU776892B2 (en)
DE (2) DE10011645A1 (en)
ES (1) ES2316407T3 (en)

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US10345972B2 (en) 2014-05-23 2019-07-09 Apple Inc. RC matching in a touch screen
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AT414346T (en) 2008-11-15
DE10011645A1 (en) 2001-09-13
AU776892B2 (en) 2004-09-23
EP1133057A3 (en) 2003-04-23
ES2316407T3 (en) 2009-04-16
US20010020578A1 (en) 2001-09-13
AU2648801A (en) 2001-09-13
JP2001318366A (en) 2001-11-16
EP1133057B1 (en) 2008-11-12
DE50114477D1 (en) 2008-12-24

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